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Home >> Lexus >> 2021 >> UX 200 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Access System W/ Push-Button Start (Start Function) (Diagnostic Codes & Symptom Tests (1 Of 2)) (Except Hybrid) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) >> DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit [10/2018 - 07/2022] >> Caution / Notice / Hint

Caution / Notice / Hint

NOTE:
  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart access system with push-button start (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart access system with push-button start (for Start Function) after confirming that the communication systems are functioning properly.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022]

  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

    Refer to REGISTRATION [10/2018 - 10/2019] , or refer to REGISTRATION [10/2019 - 07/2022]

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
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